This is the receiver circuit for the previous remote control published in the same Radio Electronics magazine of November 1987. The sensor is a common phototransistor.
This circuit synthesizes a sinusoidal signal from logic pulses that can be obtained from an...
With the light falling on the LDR, the relay closes its contacts by activating a warning system. The...
This circuit was found in old English documentation. It can be improved by using resistors of...